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Re: Question: Old Irix tape backup. Recovery on Linux (xfsdump/xfsrestor

To: xfs@xxxxxxxxxxx
Subject: Re: Question: Old Irix tape backup. Recovery on Linux (xfsdump/xfsrestore)
From: Eric Sandeen <sandeen@xxxxxxxxxxx>
Date: Thu, 30 Jun 2016 12:04:07 -0500
Delivered-to: xfs@xxxxxxxxxxx
In-reply-to: <SN1PR05MB2317E464B2CFB5A06CC4B66BCC240@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx>
References: <SN1PR05MB231785E5196A5D31D0D833EACC230@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx> <SN1PR05MB23175D5BF190CCC3F22E2EB0CC240@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx> <4d9d00ef-82d5-a658-e88c-ba75fb7a6023@xxxxxxxxxxx> <SN1PR05MB2317E464B2CFB5A06CC4B66BCC240@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx>
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On 6/30/16 11:59 AM, Anthony l wrote:
> I don't think this is a multi tape dump. But then again i don't know for 
> sure. I recently got a job and this is my first 'project'. I have about 10 
> tapes each are labeled a month and a year, so I don't think they are multi 
> tape because they span like 3 years 2004-2007 . Although for the current tape 
> I am working on right now if I select 1 skip, I'll get to another back up 
> labeled "incremental backup 1" or something similar. Using the verbosity 
> output here is what I got. (also using interactive restore). I went ahead and 
> specified byte size 4096. Through earlier test using the dd command I 
> determined that was the correct size. Ill post one without byte size 
> specified too. I just saw it in that post and thought it might help.
> 
> Here is the output with verbosity.
> 
> http://pastebin.com/Nd6BqNc5
> 
> The out is the same with or without -b 4096.
> 
> http://pastebin.com/0dxbCvyc (no -b)


interactively restore from this dump?
1: skip
2: interactively restore
 (default)
->2
++++================++++
missing some stuff------

^^^ is that your comment, or actual output?

Looks like it eventually encountered a short read:

xfsrestore: drive op: read: wanted 131072 (0x20000)
xfsrestore: tape op: reading 245760 bytes
xfsrestore: tape op read of 245760 bytes short: nread == 4096
xfsrestore: tape op: get status
xfsrestore: tape status = wprot onl
xfsrestore: short read record 1 (nread == 4096)
xfsrestore: drive op read returning error rval=1

in dmesg, is there any sort of IO error from the tape?

-Eric

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